题目内容

①1-数学公式+数学公式=②1数学公式×数学公式=③1÷0.05×1.2=④(数学公式+数学公式)×12=⑤3.48+7.52=
⑥3.14÷数学公式×20=⑦1.25×数学公式=⑧12-数学公式数学公式=⑨390×0.01=数学公式+数学公式+数学公式=

解:①1-+=; ②1×=1; ③1÷0.05×1.2=24; ④(+)×12=7; ⑤3.48+7.52=11;
⑥3.14÷×20=314; ⑦1.25×=0.75; ⑧12-=11; ⑨390×0.01=3.9; ⑩++=2
故答案为:,1,24,7,11,314,0.75,11,3.9,2
分析:①按运算顺序从左往右依次计算;②把带分数化为假分数约分计算;③从左往右依次运算;④运用乘法分配律简算;⑤小数点对齐;⑥把除法改为乘法,运用乘法结合律简算;⑦约分计算;⑧运用减法的性质简算;⑨也就是把390缩小100倍,即把390的小数点往左移动两位即可;⑩运用加法结合律简算.
点评:此题考查了运算顺序以及运用运算定律简算的能力.
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0.56÷0.7= 0.125×4= 3.28×0.1= 3.9÷0.13=
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1÷2.5= 1.25×0.8= 3.2÷0.04= 0÷1.7=
0.22×102= 9.6÷0.8= 5×0.24= 4.5-0.05=
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